FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 1
======================================================
WARNING: possible circular locking dependency detected
5.18.0-rc7-syzkaller-00181-geaea45fc0e7b #0 Not tainted
------------------------------------------------------
syz-executor155/3592 is trying to acquire lock:
ffffffff8bc90700 (console_owner){....}-{0:0}, at: console_unlock+0x35e/0xdd0 kernel/printk/printk.c:2770
but task is already holding lock:
ffff88807dc0e958 (&port->lock){-.-.}-{2:2}, at: pty_write+0xea/0x1e0 drivers/tty/pty.c:120
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #2 (&port->lock){-.-.}-{2:2}:
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:162
tty_port_tty_get+0x1f/0x100 drivers/tty/tty_port.c:306
tty_port_default_wakeup+0x11/0x40 drivers/tty/tty_port.c:48
serial8250_tx_chars+0x4f3/0xa50 drivers/tty/serial/8250/8250_port.c:1866
serial8250_handle_irq.part.0+0x328/0x3d0 drivers/tty/serial/8250/8250_port.c:1953
serial8250_handle_irq drivers/tty/serial/8250/8250_port.c:1926 [inline]
serial8250_default_handle_irq+0xb2/0x220 drivers/tty/serial/8250/8250_port.c:1970
serial8250_interrupt+0xfd/0x200 drivers/tty/serial/8250/8250_core.c:126
__handle_irq_event_percpu+0x22b/0x880 kernel/irq/handle.c:158
handle_irq_event_percpu kernel/irq/handle.c:193 [inline]
handle_irq_event+0xa7/0x1e0 kernel/irq/handle.c:210
handle_edge_irq+0x25f/0xd00 kernel/irq/chip.c:817
generic_handle_irq_desc include/linux/irqdesc.h:158 [inline]
handle_irq arch/x86/kernel/irq.c:231 [inline]
__common_interrupt+0x9d/0x210 arch/x86/kernel/irq.c:250
common_interrupt+0xa4/0xc0 arch/x86/kernel/irq.c:240
asm_common_interrupt+0x1e/0x40 arch/x86/include/asm/idtentry.h:636
native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline]
arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline]
acpi_safe_halt drivers/acpi/processor_idle.c:110 [inline]
acpi_idle_do_entry+0x1c6/0x250 drivers/acpi/processor_idle.c:551
acpi_idle_enter+0x361/0x500 drivers/acpi/processor_idle.c:686
cpuidle_enter_state+0x1b1/0xc80 drivers/cpuidle/cpuidle.c:237
cpuidle_enter+0x4a/0xa0 drivers/cpuidle/cpuidle.c:351
call_cpuidle kernel/sched/idle.c:155 [inline]
cpuidle_idle_call kernel/sched/idle.c:236 [inline]
do_idle+0x3e8/0x590 kernel/sched/idle.c:303
cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:400
rest_init+0x169/0x270 init/main.c:726
arch_call_rest_init+0xf/0x14 init/main.c:882
start_kernel+0x47f/0x4a0 init/main.c:1140
secondary_startup_64_no_verify+0xc3/0xcb
-> #1 (&port_lock_key){-.-.}-{2:2}:
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:162
serial8250_console_write+0x9cb/0xc30 drivers/tty/serial/8250/8250_port.c:3358
call_console_drivers kernel/printk/printk.c:1952 [inline]
console_unlock+0x9bc/0xdd0 kernel/printk/printk.c:2774
vprintk_emit+0x1b4/0x5f0 kernel/printk/printk.c:2272
vprintk+0x80/0x90 kernel/printk/printk_safe.c:50
_printk+0xba/0xed kernel/printk/printk.c:2293
register_console kernel/printk/printk.c:3131 [inline]
register_console+0x410/0x7c0 kernel/printk/printk.c:3012
univ8250_console_init+0x3a/0x46 drivers/tty/serial/8250/8250_core.c:679
console_init+0x3c1/0x58d kernel/printk/printk.c:3231
start_kernel+0x30b/0x4a0 init/main.c:1068
secondary_startup_64_no_verify+0xc3/0xcb
-> #0 (console_owner){....}-{0:0}:
check_prev_add kernel/locking/lockdep.c:3065 [inline]
check_prevs_add kernel/locking/lockdep.c:3188 [inline]
validate_chain kernel/locking/lockdep.c:3803 [inline]
__lock_acquire+0x2ac6/0x56c0 kernel/locking/lockdep.c:5029
lock_acquire kernel/locking/lockdep.c:5641 [inline]
lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5606
console_lock_spinning_enable kernel/printk/printk.c:1794 [inline]
console_unlock+0x3b1/0xdd0 kernel/printk/printk.c:2771
vprintk_emit+0x1b4/0x5f0 kernel/printk/printk.c:2272
vprintk+0x80/0x90 kernel/printk/printk_safe.c:50
_printk+0xba/0xed kernel/printk/printk.c:2293
fail_dump lib/fault-inject.c:45 [inline]
should_fail+0x472/0x5a0 lib/fault-inject.c:146
should_failslab+0x5/0x10 mm/slab_common.c:1313
slab_pre_alloc_hook mm/slab.h:724 [inline]
slab_alloc_node mm/slub.c:3131 [inline]
slab_alloc mm/slub.c:3225 [inline]
__kmalloc+0x7e/0x350 mm/slub.c:4410
kmalloc include/linux/slab.h:586 [inline]
tty_buffer_alloc+0x23f/0x2a0 drivers/tty/tty_buffer.c:178
__tty_buffer_request_room+0x156/0x2a0 drivers/tty/tty_buffer.c:274
tty_insert_flip_string_fixed_flag+0x8c/0x240 drivers/tty/tty_buffer.c:321
tty_insert_flip_string include/linux/tty_flip.h:41 [inline]
pty_write+0x11c/0x1e0 drivers/tty/pty.c:122
n_tty_write+0xa7a/0xfc0 drivers/tty/n_tty.c:2271
do_tty_write drivers/tty/tty_io.c:1024 [inline]
file_tty_write.constprop.0+0x520/0x900 drivers/tty/tty_io.c:1095
call_write_iter include/linux/fs.h:2050 [inline]
new_sync_write+0x38a/0x560 fs/read_write.c:504
vfs_write+0x7c0/0xac0 fs/read_write.c:591
ksys_write+0x127/0x250 fs/read_write.c:644
do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline]
__do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178
do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:203
entry_SYSENTER_compat_after_hwframe+0x4d/0x5c
other info that might help us debug this:
Chain exists of:
console_owner --> &port_lock_key --> &port->lock
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&port->lock);
lock(&port_lock_key);
lock(&port->lock);
lock(console_owner);
*** DEADLOCK ***
6 locks held by syz-executor155/3592:
#0: ffff88801dba4098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:244
#1: ffff88801dba4130 (&tty->atomic_write_lock){+.+.}-{3:3}, at: tty_write_lock drivers/tty/tty_io.c:950 [inline]
#1: ffff88801dba4130 (&tty->atomic_write_lock){+.+.}-{3:3}, at: do_tty_write drivers/tty/tty_io.c:973 [inline]
#1: ffff88801dba4130 (&tty->atomic_write_lock){+.+.}-{3:3}, at: file_tty_write.constprop.0+0x299/0x900 drivers/tty/tty_io.c:1095
#2: ffff88801dba42e8 (&tty->termios_rwsem){++++}-{3:3}, at: n_tty_write+0x1bf/0xfc0 drivers/tty/n_tty.c:2231
#3: ffffc90001c08378 (&ldata->output_lock){+.+.}-{3:3}, at: n_tty_write+0xa47/0xfc0 drivers/tty/n_tty.c:2270
#4: ffff88807dc0e958 (&port->lock){-.-.}-{2:2}, at: pty_write+0xea/0x1e0 drivers/tty/pty.c:120
#5: ffffffff8bd70b40 (console_lock){+.+.}-{0:0}, at: vprintk+0x80/0x90 kernel/printk/printk_safe.c:50
stack backtrace:
CPU: 1 PID: 3592 Comm: syz-executor155 Not tainted 5.18.0-rc7-syzkaller-00181-geaea45fc0e7b #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
check_noncircular+0x25f/0x2e0 kernel/locking/lockdep.c:2145
check_prev_add kernel/locking/lockdep.c:3065 [inline]
check_prevs_add kernel/locking/lockdep.c:3188 [inline]
validate_chain kernel/locking/lockdep.c:3803 [inline]
__lock_acquire+0x2ac6/0x56c0 kernel/locking/lockdep.c:5029
lock_acquire kernel/locking/lockdep.c:5641 [inline]
lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5606
console_lock_spinning_enable kernel/printk/printk.c:1794 [inline]
console_unlock+0x3b1/0xdd0 kernel/printk/printk.c:2771
vprintk_emit+0x1b4/0x5f0 kernel/printk/printk.c:2272
vprintk+0x80/0x90 kernel/printk/printk_safe.c:50
_printk+0xba/0xed kernel/printk/printk.c:2293
fail_dump lib/fault-inject.c:45 [inline]
should_fail+0x472/0x5a0 lib/fault-inject.c:146
should_failslab+0x5/0x10 mm/slab_common.c:1313
slab_pre_alloc_hook mm/slab.h:724 [inline]
slab_alloc_node mm/slub.c:3131 [inline]
slab_alloc mm/slub.c:3225 [inline]
__kmalloc+0x7e/0x350 mm/slub.c:4410
kmalloc include/linux/slab.h:586 [inline]
tty_buffer_alloc+0x23f/0x2a0 drivers/tty/tty_buffer.c:178
__tty_buffer_request_room+0x156/0x2a0 drivers/tty/tty_buffer.c:274
tty_insert_flip_string_fixed_flag+0x8c/0x240 drivers/tty/tty_buffer.c:321
tty_insert_flip_string include/linux/tty_flip.h:41 [inline]
pty_write+0x11c/0x1e0 drivers/tty/pty.c:122
n_tty_write+0xa7a/0xfc0 drivers/tty/n_tty.c:2271
do_tty_write drivers/tty/tty_io.c:1024 [inline]
file_tty_write.constprop.0+0x520/0x900 drivers/tty/tty_io.c:1095
call_write_iter include/linux/fs.h:2050 [inline]
new_sync_write+0x38a/0x560 fs/read_write.c:504
vfs_write+0x7c0/0xac0 fs/read_write.c:591
ksys_write+0x127/0x250 fs/read_write.c:644
do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline]
__do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178
do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:203
entry_SYSENTER_compat_after_hwframe+0x4d/0x5c
RIP: 0023:0xf7e9f549
Code: 03 74 c0 01 10 05 03 74 b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
RSP: 002b:00000000ffc650ec EFLAGS: 00000246 ORIG_RAX: 0000000000000004
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000020c34fff
RDX: 00000000ffffff0b RSI: 0000000000000035 RDI: 00000000ffc65204
RBP: 00000000ffc6520c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
CPU: 1 PID: 3592 Comm: syz-executor155 Not tainted 5.18.0-rc7-syzkaller-00181-geaea45fc0e7b #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
fail_dump lib/fault-inject.c:52 [inline]
should_fail.cold+0x5/0xa lib/fault-inject.c:146
should_failslab+0x5/0x10 mm/slab_common.c:1313
slab_pre_alloc_hook mm/slab.h:724 [inline]
slab_alloc_node mm/slub.c:3131 [inline]
slab_alloc mm/slub.c:3225 [inline]
__kmalloc+0x7e/0x350 mm/slub.c:4410
kmalloc include/linux/slab.h:586 [inline]
tty_buffer_alloc+0x23f/0x2a0 drivers/tty/tty_buffer.c:178
__tty_buffer_request_room+0x156/0x2a0 drivers/tty/tty_buffer.c:274
tty_insert_flip_string_fixed_flag+0x8c/0x240 drivers/tty/tty_buffer.c:321
tty_insert_flip_string include/linux/tty_flip.h:41 [inline]
pty_write+0x11c/0x1e0 drivers/tty/pty.c:122
n_tty_write+0xa7a/0xfc0 drivers/tty/n_tty.c:2271
do_tty_write drivers/tty/tty_io.c:1024 [inline]
file_tty_write.constprop.0+0x520/0x900 drivers/tty/tty_io.c:1095
call_write_iter include/linux/fs.h:2050 [inline]
new_sync_write+0x38a/0x560 fs/read_write.c:504
vfs_write+0x7c0/0xac0 fs/read_write.c:591
ksys_write+0x127/0x250 fs/read_write.c:644
do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline]
__do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178
do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:203
entry_SYSENTER_compat_after_hwframe+0x4d/0x5c
RIP: 0023:0xf7e9f549
Code: 03 74 c0 01 10 05 03 74 b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
RSP: 002b:00000000ffc650ec EFLAGS: 00000246 ORIG_RAX: 0000000000000004
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000020c34fff
RDX: 00000000ffffff0b RSI: 0000000000000035 RDI: 00000000ffc65204
RBP: 00000000ffc6520c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
----------------
Code disassembly (best guess):
0: 03 74 c0 01 add 0x1(%rax,%rax,8),%esi
4: 10 05 03 74 b8 01 adc %al,0x1b87403(%rip) # 0x1b8740d
a: 10 06 adc %al,(%rsi)
c: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi
10: 10 07 adc %al,(%rdi)
12: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi
16: 10 08 adc %cl,(%rax)
18: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi
1c: 00 00 add %al,(%rax)
1e: 00 00 add %al,(%rax)
20: 00 51 52 add %dl,0x52(%rcx)
23: 55 push %rbp
24: 89 e5 mov %esp,%ebp
26: 0f 34 sysenter
28: cd 80 int $0x80
* 2a: 5d pop %rbp <-- trapping instruction
2b: 5a pop %rdx
2c: 59 pop %rcx
2d: c3 retq
2e: 90 nop
2f: 90 nop
30: 90 nop
31: 90 nop
32: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi
39: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi